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404 N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)988-9600 <br /> Analytical FAX(925)988-9573 <br /> www s° oialabs c <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #100 Project Number Arco#4932,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 24-Jul-02 12 03 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Walnut Creek <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> DMW-3,55'(W206289-10)Sod Sampled _12-Jun-02 09 50 Received 14-Jun-02 08 55 <br /> tert-Butyl alcohol ND 2 5 mg/kg 100 2F25021 20-Jun-02 26-Jun-02 EPA 8260B <br /> Methyl tert-butyl ether(MTBE) 044 020 " <br /> Di-isopropyl ether ND 010 <br /> Ethyl tert-butyl ether ND 010 " <br /> Cert-Array]methyl ether ND 010 " <br /> 1,2-Dichloroethane ND 010 " <br /> 1,2-Dibromoethane ND 020 " <br /> Surrogate Dibromofluoromethane 121% 50-150 " <br /> Surrogate 1,2-Dichloroethane-d4 964% 50-150 <br /> DMW-3,60'(W206289-11)Sod Sampled 12-Jun-021000 Received 14-Jun-02 08 55 _ <br /> tert-Butyl alcohol ND 2 5 mg/kg 100 2F25021 20-Jun-02 26-Jun-02 EPA 82608 <br /> Methyl tert-butyl ether(MTBE) ND 020 " <br /> Di-isopropyl ether ND 010 <br /> Ethyl tert-butyl ether ND 010 <br /> tert-Amyl methyl ether ND 010 " <br /> 1,2-Dichloroethane ND 010 <br /> 1,2-Dibromoethane ND 020 " <br /> Surrogate Dibromofluoromethane 117% 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 92 0% 50-150 " <br /> DMW-3,70'(W206289-12)Sod Sampled 12-Jun-021010 Received 14-Tun-02 08 55 <br /> tort-Butyl alcohol ND 25 mg/kg 100 2F2502120-Jun-02 26-Jun-02 EPA 8260B <br /> Methyl tert-butyl ether(MTBE) ND 020 " <br /> Di-isopropyl ether ND 010 <br /> Ethyl tert-butyl ether ND 010 <br /> tert-Amyl methyl ether ND 010 " <br /> 1,2-Dtchloroethane ND 010 " <br /> 1,2-Dibromoethane ND 020 <br /> Surrogate Dibromofluoromethane 113% 50-150 " <br /> Surrogate 1,2-Dichloroethane-d4 924% 50-150 " <br /> Sequoia Analytical-Walnut Creek The results In this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced In its entirety <br /> Page 23 of 38 <br />